Clamp and method of manufacturing the same



July 18, 1933. M, H RRAVE 1,918,469

CLAMP AND METHOD OF MANUFACTURING THE SAME Filed July so. 1931 INVENTORATTORNEYS bi1ity. a I p 7 It is a further object to provide an im-Patented July 1 8, :1933

verm n. mugs,emi r s i slp; .y;

A lication maa a ya This sinventionzrelates' to ,-clamps,, and isparticularly directed tosimprovements in athamanu'facture andconstructionj'of that type of clamp" known as the .CV-type, wherein onearm includes afistationary pad or jaw 11 opposing an adjustable jaw orscrew mount ,ed'i'n the otherarm. Heretofore, the bodies of these clampshave been of heavy malle '-;able'-iron construction or drop forgings.

" It is the broad object of this invention The more particular featuresarethatthe pad is formed in'the bodyofithe material after the 'body hasbeeninitially formed .in-

to a general C-sha'pe andthe-nut portion kfor'thescrewisa;separatefpieceof a par :ticularmetal integrallyunited tothabody,

the metal of the nut portion beingsuitable (525 for more e'fiicientdrillingandtapping and the metal constituting the major portlon of theclamp body being suitable forpurposes ofrgreater resistance againsttwisting strains,

and therefore greater rigidity and duraproved method of electricallywelding the parts together wherein the'mass of metal of the nut and mainpiece is evenly dis- T tributed in these respective 'partsfat the pointof contact or welded attachment for uniform heating of the partsandproper fiow' of electricity.

, Other objects and furtheradvantageswill' be more fully apparent from adescription of the accompanying drawing, in which:

Figure 1 is a side view illustratingthe fiat steel piece bent intoC-shape in the initial operation.

l i Figure 2 is a perspective viewshowingthe C-shaped' body pieceandillustrating the pad formed on one of the arms of the body as the secondoperation, the nut piece being shown apart from the C-shaped piece atits point of attachment. v i

glean {serial ngus;

- Figure; 3 is a perspective View illustrating T v" the third'stepin theassemblywherein the.

thepadl P g operati n the drilling and xtap 'Described Lilli general; ofmanv ufacturinglthe. clamp--includeswthree dis-1- :tinctstepsathe .firstbeing'the forming ofa length ofbargsteel into 2C-shap e," the secondbeing the forming of th'epad on one ofthe arms, a and the third beingthe integral iattachm ent of the nutlon'thearm opposing :5 Q

padal xThe heattreatment is simplified out these operations in that theflat majorportion of the clamping bod is-o'fihigh carbon steel,separately treate to provide thew required strength, whereas. the :nutis oflow carbon steel for the purposes of easy drillingand tapping.:Befor'e theassembly is complte'or before thelnut -is in place :andduring the:heating operations for forming, thejpie'oe of higlrcarbonsteel may be heattreated for further increasing its stiffness,

whereupon the drillingand tapping opera tions for the nut are-thereafterjcompleted 8 when thenut is in place.

Referring to the drawings,the length or steel forming the C-shaped'ibody of the clamp is indicated at 5,- and provides arms 6 and 7 ThisC-shaped body is placed over a form and the pad 8 isform'ed on onearmi-7 of the clamp; being flattened out under pressure to provide abroadface opposing t the opposite arm and including a strengthening rib'9 atright angles to the broad face Y and at the rear thereof.. The formationoff the C-shaped body and the pad thereof is .accomplishedfunder heatand at thesame time appropriate temperatures of heat and the properquenching operations maybe u plied for increasing the, strength of thepart.

r gure i4 is ,a side view of the completed clamp, showingtheclamping-screw assem :bled therewith after This formed body is thenplacedin'a spea I cial jig and thegenerally cylindrical formed piece1001 low carbon steelof rolled stock a is welded to the outer end of thearm op 1 The cylindrical piece in some instances, as

a in largesizes, is drilled initially as cat 11,

' the finished drilling and-tapping thereof in that is beforeattachment, for reducing its mass somewhat, this drilledhole beingv asto perfect alignmentfwith the center of the pad. This reduction the'mass ofthenut causes a more even distribution of heat about the contactpoint of the nutWith the body during the electric Welding operation,whereby the current floW is more even for a more perfect Weld. Drillingand tapping operations are then performed through the axis of thecylindricalpiece and a screw '12 is mounted therein having a tip 13 onits inner end opposing the pad.

It will be apparent thatfinaclamp body cast ,or forged in one piece, ashas been done heretofore, it is necessary to anneal the steel before itcan be drilled' and tapped,

because a high carbon steel isnecessary 1n the body of the clamp toobtain the required strength. Consequently, by :Welding pieces together,itis'possible to use a low-carbon steel forthe nut, Whichlendsitself'more readily to the necessary machining, drilling and-tappingoperations.

ofmetals is provided inthe clamp for aiding in machining and for addingto j the strength thereof.

- l 1. The process'of forming'a clamp body' I Having described myinvention, I claim By this process of manufacture andar rangementof-parts, the proper arrangement comprising forming a length of highcarbon metal into C-shape, forming a pad upon one nut piece of lowcarbon metal on the other arm and thereafter tapping saidnut piece atright angles to the pad.

'2. The process of forming a'clamp body 'comprising forming alength 'ofhigh 'carbon metal into C-shape and including a-padon one arm, welding ahollow cylindrical disposingzits axis at rightangles .to the pad, andsubsequently screw threading said hollow-cylindrical piece of metal.

3. The process of'forming a clamp body,

of the-arms of C-shaped metal, Welding a -"piece 'oflow carbon metalolrthe other'arm,

"comprising forminga length of: metal into C-slrape and including a padon g-on'e arm,

forming a cylindrical piece, of low-carbon metal to includea radial finand Welding; the fin ofv the cylindrical piece of metal on the otherarmof saidC-shapedlengthof m'etal, disposing the axis of" thecylindrical "piece at right angles to the pad'i' -i 4;. A clamp'bodycomprising a lengthof high carbon metal of barstock bent into C-shapeand having a pad on-one arm thereof, anda generally cylindrically-formednut piece of low carbonmetal of rolled stock elded in position on theother arm of said lengthfofmetal land screw-threaded to 'receiveac-lamplng'screw. V 1

5. A clamp body comprising a lengtlrof v m high carbon vmetal of C-shapehaving a pad on one arm thereof and'a generally c'ylinm drically formednut piece of low carbon metal including a radial fin Welded in 0- sition"on the other; arm ,of said length of metal and including'screw threadsforreceiving aclamplngscrew.

I JOHN: nAnon ivii-z f

